21 horsepower ( 16 kw ) rust ##on & horns ##by 4 ##y ##hr diesel engine had been purchased in 1981 and was fitted onto a permanent concrete base with the aid of a mobile crane . after fitting it was then painted . some missing or broken parts were made or repaired as necessary . off @ - @ site , the new brake wheel and fan ##tail were made . the original brake wheel was too rotten to repair , and showed evidence that it had been altered from the original one installed in 1819 . the original brake wheel was 6 feet ( 1 @ . @ 83 m ) diameter to allow the common sails to run at their opt ##imum speed . when
21 horsepower ( 16 kw ) ruston & hornsby 4yhr diesel engine had been purchased in 1981 and was fitted onto a permanent concrete base with the aid of a mobile crane. after fitting it was then painted. some missing or broken parts were made or repaired as necessary. off @ - @ site, the new brake wheel and fantail were made. the original brake wheel was too rotten to repair, and showed evidence that it had been altered from the original one installed in 1819. the original brake wheel was 6 feet ( 1 @. @ 83 m ) diameter to allow the common sails to run at their optimum speed. when